The user creates a thousand shadow clones from one shuriken, striking down the enemy. This is a technique that combines ninja tools with ninjutsu. Compared to normal shadow clones, clones of material objects are said to be on a far higher level. There is no need for preparations beforehand, like stocking up on shuriken, or kunai, yet since the shadow clones are real and not illusions, all the shadow blades that fly around are equally lethal. Because the clones form in just an instant, completely evading them is next to impossible. This technique can also be used on fūma shuriken, increasing its lethality.[3]

Trivia

As a technique invented by the Third Hokage, its conceptualisation and efficiency can certainly be said to be unique to the "Professor".